Construction formwork

Abstract

To provide a building formwork that allows for easy formation of the base of a protruding wall. [Solution] A building formwork 1 used when forming the lower base 5 of a protruding wall 4 that is formed to protrude outward from a living room in a building 2, comprising a first member 20 that is attached to the structure 6 in the building 2 after it has been formed, and a second member 21 that is made of a lighter material than the first member 20, is a long body that extends laterally from the first member 20 and has a vertical surface portion 32 that coincides with the formation position of the side surface of the base 5.

Description

Technical Field

[0001] The present invention relates to a formwork for construction.

Background Art

[0002] When constructing a structure in a building, a formwork is used for placing concrete (for example, Patent Document 1). For example, in an apartment building or the like, a protruding wall that protrudes from the living room to the outside (for example, the lower side of the veranda) may be provided.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventionally, there has been no formwork suitable for forming the base of the protruding wall. When creating a formwork by combining plywood on-site, the finish depends on the skill of the formwork worker. Therefore, after placing the concrete, the surface shape of the side may not be flat and may have dents. In this case, additional repair work to fill the dents by a plasterer is required, resulting in additional man-hours.

[0005] Therefore, an object of the present invention is to provide a formwork for construction that can easily form the base of the protruding wall.

Means for Solving the Problems

[0006] The present invention relates to a building formwork used when forming the lower base of a protruding wall that is formed to project outward from a living room in a building, comprising: a first member which is attached to a structure in the building after it has been formed, or which is positioned at the planned formation location of the structure; and a second member which is made of a material lighter than the first member, is an elongated body extending laterally from the first member, and has a vertical surface that coincides with the formation location on the side surface of the base.

[0007] According to the present invention, the side surface of the base can be formed by pouring concrete so as to face the vertical surface of the second member while the first member is attached.

[0008] In the present invention, the structure has a drainage groove formed on its upper surface, and the first member may have a groove-corresponding portion that is positioned to coincide with the groove when installed, and that prevents concrete from flowing out of the pouring position through the groove.

[0009] According to the present invention, the groove-compatible portion prevents the concrete being poured from flowing out of the groove.

[0010] In this invention, a slab is formed around the base together with the base, and the second member may have a slope that matches the slope of the upper surface of the formed slab.

[0011] According to the present invention, the boundary between the base of the protruding wall and the slab can be reliably formed.

[0012] The present invention is used by being attached to a structure after it has been formed, and the first member has a pair of vertical members that sandwich the structure from both sides in the lateral direction, and a horizontal member that connects the pair of vertical members, and one of the pair of vertical members may have a fixing member that approaches and moves away from opposing sides of the structure, and when approaching, abuts against the side, thereby attaching the first member.

[0013] According to the present invention, the fixing member can surely fix the first member.

[0014] In the present invention, the upper surface of the structure is an inclined surface, and a part of the lower surface of the horizontal member may have an inclination adjusting portion that contacts a lower region of the upper surface of the structure to keep the horizontal member horizontal.

[0015] According to the present invention, even if the upper surface of the structure is an inclined surface, it is easy to keep the horizontal member of the first member horizontal.

[0016] In the present invention, the horizontal member may be plate-shaped and have a through window penetrating in the thickness direction.

[0017] According to the present invention, the fixing state of the first member can be easily confirmed by the through window.

Effects of the Invention

[0018] According to the formwork for construction of the present invention, the base portion of the protruding wall can be easily formed.

Brief Description of the Drawings

[0019] [Figure 1] It is a front view of the formwork for construction according to an embodiment of the present invention. [Figure 2] It is a rear view thereof. [Figure 3] It is a plan view thereof. [Figure 4] It is a right side view thereof. [Figure 5] It is a front view of the usage state thereof. [Figure 6] It is a perspective view thereof. [Figure 7] It is a plan view showing the construction state thereof. [Figure 8] It is a front view of the formwork for construction according to another embodiment. [Figure 9] It is a plan view thereof. [Figure 10] It is a left side view thereof. [Figure 11] It is a perspective view thereof. [Modes for carrying out the invention]

[0020] A building formwork according to one embodiment of the present invention will be described with reference to Figures 1 to 7. The building formwork 1 is used to form the lower base 5 of a protruding wall 4 that is formed to protrude outward from a living room 3 in a building 2. Here, building 2 is, for example, an apartment building. In the following description, the left and right directions when facing the front of building 2 are referred to as the left-right direction, and the direction perpendicular to the left-right direction is referred to as the front-back direction. The building formwork 1 is used in the front-back direction when in use.

[0021] The building formwork 1 is fixed to the structure 6 in the building 2. In this case, the structure 6 is assumed to have already been formed in the building 2, for example, to be a precast concrete (PCa) nose that is poured for the corridor 7 or balcony 8. In this embodiment, the projecting wall 4 is a wing wall, which is located between the corridor 7 and the balcony 8 and is a wall that projects outward from the living room 3.

[0022] As shown in Figure 6, the structure 6 is a typical precast concrete (PCa) structure. Specifically, the structure 6 has a three-dimensional shape that follows the left-right direction of the corridor 7 and balcony 8, and a drainage groove 9 is formed in the middle of the front-to-back direction of the upper surface of the structure 6.

[0023] The structure 6 is divided into a front section 10 and a rear section 11 via a groove 9. In this embodiment, the front section 10 has a larger cross-section than the rear section 11.

[0024] The cross-sectional shape of the groove 9 will now be described. The groove 9 has a front portion 12 that is located on the front side and is formed vertically, a rear portion 13 that is located on the rear side and is inclined forward as it goes downward, and a bottom portion 14 that connects the front portion 12 and the rear portion 13 at the bottom. The front portion 12 is formed higher than the upper end of the front portion 12 and the upper end of the rear portion 13.

[0025] The cross-sectional shape of the front part 10 of the structure will now be described. The front part 10 of the structure is formed at the upper end of the front part 12 of the groove part 9 and includes a one-sided inclined part 15 that is inclined upward towards the front and a one-sided hanging surface part 16 that hangs down from the front end of the one-sided inclined part 15.

[0026] The cross-sectional shape of the rear section 11 of the structure will now be described. The rear section 11 of the structure is formed at the upper end of the rear surface 13 of the groove 9 and includes a other inclined section 17 that slopes upward towards the rear and a other hanging surface 18 that hangs down from the rear end of the other inclined section 17. Note that the other inclined section 17 is positioned lower than the one inclined section 15.

[0027] The building formwork 1 will now be described. In this embodiment, the building formwork 1 is provided in pairs, left and right, and concrete is poured between the building formwork 1 to form the lower base 5 of the protruding wall 4.

[0028] The building formwork 1, as shown in Figures 1 to 4, has a first member 20 and a second member 21. The first member 20 covers the structure 6 from a portion of the top and a portion of the sides (an example of installation). The second member 21 is a long, elongated body extending backward from the first member 20. In this case, the first member 20 is made of metal, and the second member 21 is made of a material lighter than metal, for example, the second member 21 is made of wood. In other words, the first member 20 and the second member 21 have different masses per unit volume, and the second member 21 is made of a material that is lighter than the first member 20.

[0029] The first member 20 will now be described in detail. In this embodiment, the first member 20 is detachably fixed to the structure 6. As shown in Figure 5, the first member 20 consists of a pair of vertical members 22 and 23 that sandwich the end of the front part 10 of the structure 6 from both sides in the lateral direction (front-rear lateral direction), a horizontal member 24 that connects the pair of vertical members 22 and 23 at the top, and a groove corresponding part 25.

[0030] The pair of vertical members 22 and 23 are each formed in a plate shape along the vertical direction. Of the pair of vertical members 22 and 23, one vertical member 22 can abut against the one hanging surface portion 16 of the structure 6 from above, and the other vertical member 23 faces the front portion 12 of the groove portion 9.

[0031] The horizontal member 24 is formed in a plate shape that lies horizontally and connects the upper ends of both vertical members 22 and 23 in the lateral direction. The horizontal member 24 also has a through-window 24a that penetrates through it in the thickness direction.

[0032] The groove-corresponding portion 25 is formed at the ends of a pair of vertical members 22, 23 and a horizontal member 24, and is positioned adjacent to the end of the structure 6, forming a plate shape that runs vertically. The groove-corresponding portion 25 has a groove body portion 26, a connecting portion 27, and an extension portion 28.

[0033] The groove body portion 26 is formed to correspond to the front portion 12, rear portion 13, and bottom portion 14 of the groove portion 9, and is positioned to coincide with the groove portion 9. The function of the groove body portion 26 is to prevent concrete from flowing out from the concrete pouring position of the base portion 5 into the groove portion 9.

[0034] The connecting portion 27 is formed as a plate that hangs down from the end of the horizontal member 24. The extension portion 28 is formed as a plate that extends rearward from the horizontal member 24, and together the connecting portion 27 and the extension portion 28 form a rectangular shape that is long in the front-to-back direction. Below the space between the connecting portion 27 and the extension portion 28, the groove body portion 26 is formed.

[0035] By the way, one of the pair of vertical members 22, 23, in this embodiment, the other vertical member 23, has a fixing member 29 that approaches and moves away from the front surface 12 of the groove 9, and when approaching, contacts the front surface 12 to fix the first member 20. The fixing member 29 is a bolt and nut mechanism, and its tip includes a pressing plate 30 that can contact the front surface 12.

[0036] The fixing member 29 moves in and out in a direction perpendicular to the other vertical member 23. When the fixing member 29 approaches the front portion 12, the push plate 30 fixes the front portion 12 and the other vertical member 23, thereby fixing the first member 20 to the structure 6. The first member 20 can be removed from the structure 6 by the fixing member 29 and the push plate 30 moving away from the front portion 12. In this embodiment, there is one fixing member 29 and one push plate 30, but multiple can be provided.

[0037] Next, the details of the second member 21 will be described. The second member 21 has a top surface portion 31 that extends rearward from the horizontal member 24, and a vertical surface portion 32 that extends rearward from the extended portion 28 of the connecting portion 27. The top surface portion 31 is a substantially horizontal plate-like body, and the vertical surface portion 32 is a substantially vertical plate-like body. The top surface portion 31 and the vertical surface portion 32 are joined via their respective ends.

[0038] The top surface portion 31 is positioned so that a part of it is recessed into the end of the horizontal member 24, and the horizontal member 24 and the top surface portion 31 are connected by screws N. The tip of the vertical surface portion 32 is positioned inside the extension portion 28 of the connecting portion 27. In this case, the tip of the vertical surface portion 32 is positioned so as not to interfere with the positioning of the connecting portion 27 adjacent to the groove portion 9, and the extension portion 28 and the tip of the vertical surface portion 32 are connected by screws N.

[0039] The vertical surface portion 32 is positioned to coincide with the formation position of the side surface 5a (or side surface 5b) of the base portion 5, and with the first member 20 fixed to the structure 6, concrete is poured so as to face the vertical surface portion 32 of the second member 21, thereby forming the side surface of the base portion 5.

[0040] In this embodiment, a slab is formed around the base 5 along with the base 5. Therefore, the lower edge 32a of the vertical surface portion 32 of the second member 21 has a slope that matches the slope of the upper surface of the formed slab. The slab will form corridors 7 and balconies 8 in an apartment building.

[0041] As mentioned above, the building formwork 1 is provided in pairs, left and right. Here, the left and right pair may be provided symmetrically, or they may be provided offset from each other in the lateral direction (front and back direction). In this embodiment, as shown in Figure 7, the building formwork 1 is provided in pairs, offset from each other in the lateral direction (front and back direction). In this case, the configuration of the first members 20 of the building formwork 1 is symmetrical depending on the state of the structure 6. Furthermore, the second members 21 often differ in length in the front and back direction in balconies 8 and corridors 7. In this case, the second members 21 are formed to have different lengths in the front and back direction.

[0042] The construction method for the building formwork 1 with the above configuration is as follows. That is, as shown in Figures 5 and 6, at one end on the left or right side of the structure 6, the first member 20 is attached from above to the front part 10 of the structure 6, covering one of the pair of vertical members 22 and 23, the vertical member 22, from above the one hanging surface 16 of the structure 6, and covering the other vertical member 23, from the front part 12 of the groove 9. Furthermore, the groove corresponding part 25 is attached to one end on the left or right side of the structure 6. In this case, attaching to one end on the left or right side means arranging it so as to be adjacent to one end on the left or right side.

[0043] On the one hand, when one vertical member 22 is placed along the hanging surface portion 16, the horizontal member 24 becomes horizontal, and the other vertical member 23 is placed along the front portion 12 of the groove portion 9, the bolt and nut mechanism of the fixing member 29 is brought closer toward the front portion 12, and the other vertical member 23 is fixed to the front portion 12 with the pressing plate 30.

[0044] As a result, one vertical member 22 and one hanging surface portion 16 are fixed vertically, the other vertical member 23 is parallel to the front portion 12 in the vertical direction, and the horizontal member 24 is in a horizontal position. Here, since one inclined portion 15 is inclined, a wedge-shaped gap δ is created between it and the horizontal member 24.

[0045] When the groove-corresponding portion 25 is attached to one end of the structure 6, the groove body portion 26 and the connecting portion 27 are positioned adjacent to the side surface of the structure 6, and since the second member 21 is integrally formed with the first member 20, it becomes a long, elongated body extending laterally (rearward) from the first member 20.

[0046] In this manner, a pair of left and right building formwork 1 are attached to both left and right ends of the structure 6. As shown in Figure 7, another formwork 35 made of wood or the like is constructed on the base 5 other than the area enclosed by the pair of left and right building formwork 1. Concrete is then poured onto the opposing surfaces 32b of the vertical surfaces 32 of the second member 21 and the groove corresponding portion 25 to form the lower base 5 of the protruding wall 4. Additionally, a slab with an inclined surface is formed on the opposite side of the vertical surfaces 32 of the second members 21.

[0047] Once the concrete at the pouring location has hardened, the pair of building formwork 1 on the left and right sides will be removed. At this time, since the groove body 26 and the connecting part 27 are positioned adjacent to the side of the structure 6, a gap remains between the structure 6 and the base 5 between the groove body 26 and the connecting part 27.

[0048] According to the construction method of the building formwork 1 described above, the first member 20 can be securely fixed at the base 5 of the protruding wall 4 by the fixing member 29, and with the first member 20 fixed, concrete is poured so as to face the vertical surface 32 of the second member 21, thereby forming the sides 5a and 5b of the base 5. Since such building formwork 1 can be reused, it is advantageous in terms of cost.

[0049] In this case, the through-window 24a formed in the horizontal member 24 allows for easy confirmation of the fixing state of the first member 20 to the structure 6. Furthermore, the groove-corresponding portion 25 prevents the poured concrete from flowing out of the groove portion 9 of the structure 6, and ensures the formation of a clear boundary between the base 5 of the protruding wall 4 and the slab. Moreover, although the building formwork 1 is operated by, for example, a formwork craftsman, the first member 20 of the building formwork 1 is made of metal, while the second member 21 is made of wood. Therefore, even if the second member 21 is long, it is easy to operate the building formwork 1.

[0050] The present invention is not limited to the above embodiments. For example, in the construction method of the building formwork 1 described above, as shown in Figure 5, since the inclined portion 15 is inclined, a wedge-shaped gap δ is created between it and the horizontal member 24. A wedge-shaped member for level adjustment can also be provided on the inner surface of the horizontal member 24 to be placed in such a gap δ. This makes it easier to keep the horizontal member 24 in a horizontal position.

[0051] In the above embodiment, the second member 21 is a member that extends rearward from the first member 20 and is cantilevered to the structure 6. Therefore, in order to stably maintain the posture of the second member 21, it can be supported from below by a support member (for example, a rod-shaped one). This support member can be positioned such that its lower end is placed on the upper surface of another formwork, for example, and its upper end is fixed to the vertical surface 32, for example. Alternatively, the support member can be made to have a variable vertical dimension by a screw shaft. In the above embodiment, the second member 21 was made of wood, but it can also be made of resin or metal.

[0052] In the above embodiment, the fixing member (bolt and nut mechanism) is located on the side of the second member 21 (the other vertical member 23) of the first member 20. However, it may also be provided on the opposite side of the second member (one of the vertical members 22) of the first member 20. If it is provided on the opposite side of the second member (one of the vertical members 22), it will be possible to accommodate structures 6 with different width dimensions. Specifically, the difference in width dimension is the dimension between the front portion 12 and one of the hanging portion 16.

[0053] Furthermore, the structure 6 to which the building formwork 1 is fixed may be made of precast concrete or of ordinary concrete. In the building formwork 1 according to the above embodiment, the structure 6 is a precast concrete (PCa) nose section that will become part of the corridor 7 or balcony 8 already formed in the building 2.

[0054] However, in another embodiment shown in Figures 8 to 11, the building formwork 1 can be installed before the concrete, which is to be cast in place, is poured into the structure 6 (projecting wall 4), that is, before it is poured into the planned formation location. Therefore, in the following description, when we refer to the concrete of the structure 6, we are referring to the planned formation location of the concrete. In this other embodiment, the building formwork 1 comprises a first member 20 and a second member 21.

[0055] The first member 20 is made of metal. As shown in Figures 8, 9, and 11, the first member 20 is a member that is combined with a vertical formwork 36 which is a formwork for one hanging surface portion 16 of the structure 6 (see Figure 5 for the one hanging surface portion 16). The vertical formwork 36 is a formwork that is arranged vertically and horizontally to form one hanging surface portion 16 of the structure 6.

[0056] On the other hand, the first member 20 is formed in a substantially vertical direction relative to the vertical formwork 36, so as to follow the inner surface 36a of the vertical formwork 36. As shown in Figure 10, the first member 20 includes a connecting portion 27 that covers one side 6a of the structure 6 from the side, a groove body portion 26 integrally formed behind the connecting portion 27 and positioned to coincide with the groove portion 9 (see Figure 5 for the groove portion 9), as shown in Figures 8 and 9, and an extension portion 28 that extends behind the groove body portion 26. These connecting portion 27, groove body portion 26, and extension portion 28 are formed in a plate shape along the vertical direction.

[0057] Furthermore, as shown in Figures 9 to 11, the first member 20 further includes a box portion 37 formed adjacent to the connecting portion 27. The box portion 37 has a front plate portion 38 connected to the vertical frame 36, for example by nails, a rear plate portion 39 facing the front plate portion 38 at the rear, a connecting portion 40 that spans the front plate portion 38 and the rear plate portion 39 to connect them at the sides, and a handle portion 41 that is integrally joined to the connecting portion 27.

[0058] The front plate portion 38 and the rear plate portion 39 are integrally arranged in the front-rear direction of the connecting portion 27 and are formed in a substantially rectangular plate shape along the vertical direction. Of the front plate portion 38 and the rear plate portion 39, the front plate portion 38 has nail holes 42, 42 formed at the top so that it can be connected to the vertical formwork 36 with nails. In this case, two nail holes 42, 42 are formed in the vertical direction, and the nails penetrate from the nail holes 42, 42 toward the vertical formwork 36. The upper end of the front plate portion 38 is flush with the upper end of the vertical formwork 36.

[0059] As shown in Figure 10, the connecting portion 40 has a connecting piece 43 and a bottom piece 44, and is formed in an L-shape in cross-section. The connecting piece 43 is positioned on the lower side of the front plate portion 38 and the rear plate portion 39, and is arranged to connect the front plate portion 38 and the rear plate portion 39 on the outside, and is formed in a plate shape. Furthermore, the connecting piece 43 is inclined so that it approaches the connecting portion 27 as it goes downwards.

[0060] The bottom piece 44 is integrally formed by bending the lower end of the connecting piece 43 and is positioned between the lower ends of the front plate portion 38 and the rear plate portion 39, extending in the front-rear direction.

[0061] Such a box section 37 is formed in a box shape with an open top. That is, the connecting section 27 serves as one side wall, and the connecting piece 43 is formed lower than the connecting section 27, and has a front plate section 38 and a rear plate section 39 at the front and rear. The upper ends of the front plate section 38 and the rear plate section 39 are on approximately the same plane as the upper end of the connecting section 27.

[0062] The handle portion 41 is located between the front plate portion 38 and the rear plate portion 39 and is a member formed, for example, by shaping a reinforcing bar into an inverted U shape and fixing its ends to the upper part of the connecting portion 27 by welding or the like. The upper end height of the handle portion 41 is set higher than the upper end of the connecting portion 27 of the first member 20 and the top surface portion 31 of the second member 21.

[0063] The second member 21 is made of a lighter material than the first member 20 and is a long, elongated body that extends laterally from the first member 20. Specifically, the second member 21 is made of wood. The first member 20 has horizontal members 45, 45 that are connected to the second member 21. The horizontal members 45, 45 are integrally formed at the upper ends of the connecting portion 27 and the extension portion 28, and are rectangular in shape and formed as horizontal plates.

[0064] The second member 21 has a top surface portion 31 extending rearward from the front end of the first member 20, and a vertical surface portion 32 extending rearward from the rear horizontal member 45. The top surface portion 31 is a substantially horizontal plate-like body, and the vertical surface portion 32 is a substantially vertical plate-like body. The top surface portion 31 and the vertical surface portion 32 are joined at their ends in perpendicular directions. The lower edge 32a of the vertical surface portion 32 is a slope that matches the inclination of the upper surface of the slab. Furthermore, the front portion of the top surface portion 31 is connected to the front horizontal member 45 of the first member 20 via screws N, and the middle portion of the top surface portion 31 in the longitudinal direction is connected to the rear horizontal member 45 via screws N. In addition, the upper ends of the groove body portion 26 and extension portion 28 of the first member 20 are connected to the top surface portion 31 via screws N. As shown in Figure 10, the side surface 20a of the first member 20 and the side surface 32c of the vertical surface 32 are flush with each other.

[0065] In another embodiment of the above configuration, the front plate portion 38 of the first member 20 and the vertical formwork 36 are nailed together with nails so as to pass through the nail holes 42, 42, thereby fixing the building formwork 1 to the vertical formwork 36. Since the second member 21 is long, additional members may be provided as appropriate to support it.

[0066] In this state, as shown in Figure 10, concrete is poured onto the side surface 20a of the connecting portion 27 of the first member 20 to form the structure 6. As a result, one side surface 6a of the structure 6 is covered by the side surface 20a of the first member 20. Also, in the box portion 37 of the first member 20, concrete is poured onto the outer side surface 43a of the connecting piece 43 and the back surface 44a of the bottom piece 44. In other words, the other side surface 6b of the concrete facing the side surface 6a in the left-right direction is covered by the side surface 43a of the connecting piece 43, and furthermore, the bottom surface 6c of the concrete is covered by the back surface 44a of the bottom piece 44, and the bottom surface 6c and the side surface 6a are integrated. In other words, the box portion 37 is a member that forms a drainage groove V between the side surface 6a and the other side surface 6b of the structure 6, with the bottom surface 6c as its bottom surface.

[0067] Furthermore, the side surface 32c of the vertical surface 32 of the second member 21 and the side surface 20a of the first member 20 are flush, and when a slab is formed around the structure 6, the lower edge 32a of the vertical surface 32 of the second member 21 is a slope that matches the slope of the upper surface of the formed slab. Therefore, the boundary between the base 5 of the protruding wall 4 and the slab can be reliably formed.

[0068] Incidentally, in the case of the protruding wall 4, concrete may be poured further above it to form the upper part. In this case, a plate-shaped seismic isolation slit material is provided between the base 5 and the upper part. For this reason, a shape is provided in the building formwork 1 to position a step in the base 5 into which the seismic isolation slit material is fitted. Thus, in another embodiment, the top surface portion 31 of the second member 21 is used as a cavity to position the step of the seismic isolation slit material in the base 5. Since the top surface portion 31 of the second member 21 is a cavity space, or cavity, for forming the step in the base 5 of the structure 6, concrete is poured so that the top surface portion 31 becomes a cavity.

[0069] The first member 20 is equipped with a handle portion 41. The connecting piece 43 is also positioned at an angle so that it approaches the connecting portion 27 as it goes downwards. Therefore, even if one side 6a and the other side 6b of the structure 6 are covered with concrete, the building formwork 1 can be easily removed from the concrete by gripping the handle portion 41 and pulling it upward from the drainage groove V.

[0070] In the above embodiment, the building formwork 1 is used to form a wall extending in a direction intersecting the corridor 7 or balcony 8, but it can also be used for walls other than those intersecting the corridor 7 or balcony 8. For example, the projecting wall 4 is not limited to being between the corridor 7 and balcony 8, but may be a wall of the corridor 7 or balcony 8 that constitutes the exterior wall of the building 2. In this case, the building formwork 1 is used only on the inner side of the corridor 7 or balcony 8, and ordinary formwork is used on the outer side of the exterior wall. [Explanation of Symbols]

[0071] 1: Architectural formwork, 2: Building, 3: Living room, 4: Projecting wall, 5: Base, 5a, 5b: Side, 6: Structure, 7: Corridor, 8: Balcony, 9: Gutter, 10: Front part of structure, 11: Rear part of structure, 12: Front part, 13: Rear part, 14: Bottom part, 15: One slope part, 16: One side hanging surface part, 17: Other slope part, 18 : Other hanging surface part, 20: First member, 21: Second member, 22, 23: Vertical member, 24: Horizontal member, 24a: Penetrating window, 25: Groove corresponding part, 26: Groove body part, 27 : Connecting part, 28: Extension part, 29: Fixed member, 30: Push plate, 31: Top surface part, 32: Vertical surface part, 32a: Bottom side, 32b: Opposing surface, 35: Formwork, δ: Gap

Claims

1. A building formwork used when forming the lower base of a protruding wall that is formed to project outward from a living room in a building, A first member which is attached to a structure in the aforementioned building after it has been formed, or which is positioned at the planned location for the formation of the aforementioned structure, A building formwork comprising: a second member, which is made of a material lighter than the first member, is an elongated body extending laterally from the first member, and has a vertical surface that coincides with the formation position of the side surface of the base.

2. The aforementioned structure has drainage grooves formed on its upper surface. The building formwork according to claim 1, wherein the first member is positioned to coincide with the groove when installed and has a groove-corresponding portion that prevents concrete from flowing out of the pouring position through the groove.

3. Along with the base, a slab is formed around the base. The building formwork according to claim 1, wherein the second member has a slope that matches the slope of the upper surface of the formed slab.

4. It is used by being attached to the structure after it has been formed. The first member comprises a pair of vertical members that sandwich the structure from both sides in the lateral direction, and a horizontal member that connects the pair of vertical members. The building formwork according to claim 1, wherein one of the pair of vertical members has a fixing member that moves toward and away from opposing sides of the structure, and when it moves toward the side, it abuts against the side to attach the first member.

5. The upper surface of the aforementioned structure is an inclined surface. The building formwork according to claim 4, wherein a part of the lower surface of the horizontal member has a tilt adjustment part that contacts the lower region of the upper surface of the structure to keep the horizontal member horizontal.

6. The building formwork according to claim 4 or 5, wherein the horizontal member is plate-shaped and has a through-window that penetrates in the thickness direction.

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